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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982ab289a3e1fc99930414bb1c9758e26abc9cee1b5ef4fe3b970eb09df1c4b7' 
  AND token = 'sBqOqG5ficpr2BNZoFwel2YMV8s+gBt1rNYtQYs1UL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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