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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f29f1e77d743ee9d4ed6b465640362378588ee090e4f311e2efbe1fe25d46c3' 
  AND token = 'jg4ET16naxSAm0glKESecUKj7oCZhM+duLR0bSJTFDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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