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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6672119e501bf1ad27f79658915c32333635a5abb3457a8e18bce3c773d5ca09' 
  AND token = 'F2gBAuvuUmPOhMz3RuelvxuFAlLfAXIndFPtwKSi1kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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