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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7d3c750222e7a8b50bb9822dee8fc3e829b17c6f92fc0abf13cd29711b3d54' 
  AND token = 'bZoczmVQI/Gie6oNsl/19HUb4WEYSaDHquu2CUDnkd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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