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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ca776afabd96e5d419a666210d8d602de3d9bbe0e85e184f41e1df4e454aff' 
  AND token = 'mnRHDSV2r4J+gyWP4OX4Np1br5kiCZN7s6iFjD2baAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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