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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f19a71f918eccc18490034d0c739d8ceab99594c8cc4867d698f7f12e34c80' 
  AND token = '7qAx8bjYU1F9olYZlW5i1Cb+/wl9ZpvT3A3tRTyUbq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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