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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3bf7060e0623ac22b32995298a5334a3ef3a7a2de7c5939cfe6f12c27abc3e' 
  AND token = 'MxiDMBTzZtZ9Nvf9ZZHe5lIycv6XehW6RZIAqm4jl9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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