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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126baabbb0ee6615a010b25bdbe7ebaa28a1dfaa51f8f46fa02012f13c0b938a' 
  AND token = 'GecchW+NeAbYcJQIR+isDRet5TGZ8C5G7I5pWuWDLYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}