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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c37262d1ade653e84af034a5ea4710632f89b5a580df3f7e6a85ef5e344a02' 
  AND token = 'z4PrXWBULCD1HjkrePXfYkLmBfKTIBcRuNkNR5fBVCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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