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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a747f990eb8e7a9d19633c16714cf40180c646cd723fac1b851ad1b97e179d' 
  AND token = 'RFbf1ol0uMxW9onrC8OmDBfzc/A+TyxcV6pA0+zsnJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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