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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd7e7157c85bca814ce6da43f0b928d8a67b1d8b47b28ca230f3861b73d3620' 
  AND token = 'zHiusYWPl5XCk6l0pTvq1NuHWZn3YaQ/oqaa5+oL7WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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