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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713d8a3d2f0e5aea66ddaaf63eead580e728e32de44a112f12f3c8865bdd3cb4' 
  AND token = '//3hCrKLSLQpx9LG5bBGTB2IY+/GxuJ+AbO7BwJ1iAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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