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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16514150fb0b02f8e5456ffac7c8609dce34ba38a4704836735d2269bb8c6ab1' 
  AND token = 'OO10G8jO0NYP6X/PmW5mWJnybta+inYnudnh8ZX3TSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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