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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0a54b3aec42de0888346d2c677666bd4cb5c720b41aa935d49d7ceec6a39a6' 
  AND token = 'MOsR8JR054TA9CDMHO13zecKOjaDuTswlQO+glW5YdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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