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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e70ec2148ebc719ec0c82edf040e0f5d0e0a8943886ff757ad7c08f150243b' 
  AND token = 'AX3asDJzQwtYqpzf4dO++KLulkQWopWP2SBMtbWFpnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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