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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7977eeb1a226a7ab4d495798eb0f46fc4a2b10e6a7801b401fbf2d9a86dd62b3' 
  AND token = '9m3Fob3qw82f4cpl1Ct3XtjDiD1wEt57Z68jfV305h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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