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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5bdf73ea744d8fb1d289ae84eccaa783d71e579f87432a61d4f9b02b4aa91b' 
  AND token = 'DzX9fhlCi2tuG7ox96i5wvv9UJ9NTBbeCbMqvSbyeuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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