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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b715e13973f176641882c9900ef7a2e8eed5c9c7f1dd00dff903c6ea720a8887' 
  AND token = 'jN0pCYZksm5wYvnsDhtgrlFA3/upeF3wYNjK/z3ie58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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