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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9a51d4613188ffa020a5d5455f91a10a1e0543ced90d87d004d2b133620896' 
  AND token = 'gFBygq7mdGblsOe2+aARqTojsjFbcI+jCqQdP1VHLVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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