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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9538e72389535210cd160e507bfdffc76e8d67d796e165ead7005e8939b4ae28' 
  AND token = 'N/uYb/L/x/zH7WqUtHHpkbb2/FejQ9XUAOtjJxonnyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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