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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f127c6689609cd51a71df81d7ba83f47e1b3cf2263798aae5ef3e4c9c4293eb3' 
  AND token = 'ffSprofO2mfwLbOkaZG/ooT206LT9XI4GQAvCiXrfl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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