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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472e6f16a4846f21c3429ea3fc9da1839d313cbbaf5068d73ba341e5d615ab5a' 
  AND token = 'oXwOn/XcHAG+Fh07wbMYl/CSs+kA1rTCNPGviEmlSn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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