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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827d711d78b48fa7b901bd41fe0e119917f21c0ef6f99d0ecf2e1e6c6ac2aac9' 
  AND token = 'a8uQn5EDX0ALMyR3xmtdcyNNB2bFljmCE0s5NhY3x34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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