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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98765bac0f92b9700c24a3e760970f7ffba2894955c14ced2d8f0ce0219ac3f3' 
  AND token = 'o0han34IluRZzaIl0Paxj4quelh9GLV6USNUW/vmBr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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