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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42f86374f20d34e56017a948dbeacf9257f27910e96e393e87dd613afd20d28' 
  AND token = 'FzMdAaNVW/6V0t/9ODB2dAzm/ceDlLtve8Xe2AsnEHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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