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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3f0e66cc4860bca68f57303533c622112356f6d190712c65e855b94a661004' 
  AND token = 'WTGp9ymVyaaGGcspv/kj6O8LsMk/EcaOmXM5eU4OCVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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