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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f2234b97d5c5a2f0e29371c7a8a6c3fe730d8c02de1ed00adcc3c4f82fab10' 
  AND token = 'W0Lxwe48/vCd8KOsHqrYVQNFKfDE57BZdfDRIv3KCBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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