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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55be6deafb5a05b47f06ba2ac51ca7f2db6d8ae164626dbb16de0f9b62b222a' 
  AND token = '3GIngJcCzUA96FB2Bt8wWkwHTlIRqiNpIJw8niU8ehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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