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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14dfb65bf3151b069ce41cfc8a3170865c5820c6f4480dfd816b60d68e58a59a' 
  AND token = '7Ray9DuBeZcsc1IC5H8g+hI+Jx6jsP0m8r4eW92W5vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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