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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02f35ce0bf6aa9a347ae82be731708ffb6e0af3d011803601d5f38a8d1efbfb' 
  AND token = 'hc/I9UfL8oJCQVeClKz3qmKzsewTP4lzLEGf41sgIPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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