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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600b15b5357e43aff2734d783a7c43d5b6c3aea4354c7c01d31bb70507fe3d3b' 
  AND token = 'fmHjNzaMWxxmnblX+p4CRTZXB+rKDftYtQ9OKfAEY9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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