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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50be37c1390b993d4700b01949a1b5a8d76cfe42c2f19620c304fef3af4aa3fa' 
  AND token = 'Mqg47AhkqlR1z/v6Sd1t7JUY4AMFpQXU+WGtwCSHsNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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