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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f5b0d74b6aa447ce3eb69d344facf59dd77fa17c31036eb3dc6c7c29175eba' 
  AND token = 'ozIlBQTqQeSFLcfZe/0hA1wnJ2PmMPNedNBs9/YASgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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