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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e6404159b3676eb77f94d1f0595c42456b3062738063ecb12e6e0138c5ae94' 
  AND token = 'R2/DI8cjbC2xZUgyLYUWMxk08xbSku0hiD3CI6yAcrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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