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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d5dcb3dd6ba3be8a4f42391d88deab32bf66b2a2779a22906c17687c84d9d4' 
  AND token = '0wae2/FoAPOMd3Z2otUnnSeoCWHSmhTKxPq0kHCJ0Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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