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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a031d1904316075f94f00e8d75812a1b0b591dad4173f3bdf204cc45032076e3' 
  AND token = 'djL3s67d47uzQuN3DJ6k6iHGu9Gtcmh5+PapgBVl+eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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