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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4362b3041d0f348e50d3f5a7c18b4a2b1d49053cd0945be6fe0709666cb4a83' 
  AND token = 'Nix4u5BVC8ZkhrQlVYUKgpKHPeN4Q2i8pQySz0934qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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