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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df7687e76a0afec0f55a1b31d9cdf07ef93c09d2e6de75665997522d9d905fe' 
  AND token = 'Ri464aSplQ0/rK/U7IcB2OS/9fYTEtPi5hlQatU2P4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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