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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5626b3f7ad6187b1bdc2a5abec016b0b73b3431fcac0094d135f417bbc15a9' 
  AND token = '2VBSGt94sJsg24Ssdn+76e/mkWisKWuIBQrbu8bkNAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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