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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cceed0e9941b93aa73b6d6a2c95bc4e1f45426319951bf3f9d62f4048858f1' 
  AND token = 'TfrTGxBIF9JfNRKvaRwnDMklWLzOkIdwTJk7Tsk0GHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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