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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71a61dd9f4260481d5c5e56301360c979d31b6cebf33b3b94bf30eecffca929' 
  AND token = 'yfcS2s/HuBb/abS0+lWEesemF2NhC+/VwN5/PXZQ4FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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