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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1901a84aff107ea4f50e61c9cfabb48787d28acf2150a6a5460db884270dd95d' 
  AND token = 'TLpfTklZqJwQJ0TnK1oMOZlCQ5nb5zVWW/GdSNynMNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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