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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2986993fb72b76780e607e62cda4dc9690242c5bc3b880ed01ab6b5e2cd265' 
  AND token = 'TSdiI7VuaNeTr/UGyBx/J1q/+vNjHCxlk6k0GTiC4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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