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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8de3927b82aab0c29ef25e9a09936d2c4662fd982ac5c3030ba2e8f2ed9a8cf' 
  AND token = 'yCHAXgI7ycFYb+vECimnlXVyHI96YUazj71czPa+KMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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