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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a537a1d96031d9971c5d0f5e737db6792122d8ce46041b43aee372e18ea8566b' 
  AND token = 'jOUQ9Ye9nbQJXbEYYYBKvBzy8DAWyVtW1n8u6wdmZy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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