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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d492fb9bc677a2f9114cc57c03bea07b0af3ea3210dc8eed5b961a0a30246e' 
  AND token = 'nQbqTrgXmu1kM+uX7GZF1by46lx58O2sx2VY2kynXKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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