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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0669f03cc9663e4781d7198dd73c41d4bcb552562773286ded6d92d2ffc56050' 
  AND token = 'RBq/uLcF4MgmL2iLtgZLSQZeOmf92h9P6rbKgksdrV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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