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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1eaf94c2cba16a07a4159ff2896f15182f98986d9ed596813f6de53d00fa483' 
  AND token = 'Hgng2RooGmX7/98MndIeaomuITzXL0waE2HeHM5JplA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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