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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7f2dd29ffce406453832e550334723b87754e2423bac46575f23005e7ba6a9' 
  AND token = 'wp4EpoyBR3/sm/qHAixjLnWXE41++Vy7Nez+mDMGXlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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