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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4a3cf3f6ebc41934fec9ed94a4131337ab870cda1a0e2fda0011568545ed36' 
  AND token = 'MlS6tCiRfNgvxE+F4lKNKtzFs2rCqiRwXscoB1m9wVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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