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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b538712c0b370123ea0337f989fc0183ec2b0f02bed28b664710f8b1dfc75bc' 
  AND token = '7Bx7POS3s2e5+5XBOearn15jPNMJ7x5InE81N2gtSKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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