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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaeeec050c55a05773ad6aa03c63c0de76ffe87992f1f45c0849c70977c139db' 
  AND token = '9jSRGYcPv9yiLF7QRM6y0rezd5bN4da+r/HdcSfI/cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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