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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368444bb64d010e0d1fae0d7a3cfba9e363d0dd100db0c94f884e5133712a225' 
  AND token = 'JO71EDJVv6jwNoQ4f2lCK7BZ1539Llw9iHEutMgfAG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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