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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73df770ae25b2ef103bd0ed9fa3705e9904f54f8c73f6f65a07d9ebdfdb5eb08' 
  AND token = 'LC/qc6259+w3oLClG4tdV8nhmXAOxHeGLNv0NBMpzSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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