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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7fbb802b1835bd55dea64800915cf2c1e84e00d7a8bd4013cf8ab4ad141f77' 
  AND token = 'nYUeF8WScqM8Cy2nCq83HdolAx6tiWxIu9muUdOU4B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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